/*
 * Copyright (c) 2020 - present, Inspur Genersoft Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.inspur.edp.cef.generator.repository.repository.method;

import com.inspur.edp.caf.generator.baseInfo.ParameterInfo;
import com.inspur.edp.caf.generator.baseInfo.TypeInfo;
import com.inspur.edp.caf.generator.method.ClassMethodGenerator;
import com.inspur.edp.cef.generator.repository.repository.nestedrepository.DataTypeReposGenContext;
import com.inspur.edp.cef.repository.dac.MainEntityDac;
import org.eclipse.jdt.core.dom.*;

import java.util.ArrayList;

public class GetDacMethodGenerator extends ClassMethodGenerator
{
	private String fieldName;
	private DataTypeReposGenContext reposContext;

	public GetDacMethodGenerator(String fieldName, DataTypeReposGenContext reposContext)
	{
		this.fieldName = fieldName;
		this.reposContext = reposContext;

	}
	@Override
	protected String getMethodName()
	{
		return "getMainEntityDac";
	}

	@Override
	protected TypeInfo getReturnType() {
		return new TypeInfo(MainEntityDac.class.getTypeName());
	}

	@Override
	protected boolean getIsOverride() {
		return true;
	}

	@Override
	protected ArrayList<Modifier.ModifierKeyword> getAccessModifiers() {
		ArrayList<Modifier.ModifierKeyword> list =new ArrayList<>();
		list.add(Modifier.ModifierKeyword.PROTECTED_KEYWORD);
		return list;
	}

	@Override
	protected ArrayList<ParameterInfo> getParameterCollection() {
		return null;
	}

	@Override
	protected Block buildMethodBody() {
		Block block=ast.newBlock();
		buildNewDacWhenNull(block);
		buildReturnStatement(block);
		return block;
	}

	private void buildNewDacWhenNull(Block block) {
		IfStatement ifStatement=ast.newIfStatement();
		buildIfExpression(ifStatement);
		buildIfThen(ifStatement);
		block.statements().add(ifStatement);
	}

	private void buildIfExpression(IfStatement ifStatement) {
		InfixExpression infixExpression=ast.newInfixExpression();
		infixExpression.setLeftOperand(ast.newSimpleName(fieldName));
		infixExpression.setOperator(InfixExpression.Operator.EQUALS);
		infixExpression.setRightOperand(ast.newNullLiteral());
		ifStatement.setExpression(infixExpression);
	}

	private void buildIfThen(IfStatement ifStatement)
	{
		Block block=ast.newBlock();
		Assignment assignment=ast.newAssignment();
		assignment.setLeftHandSide(ast.newSimpleName(fieldName));
		assignment.setOperator(Assignment.Operator.ASSIGN);
		ClassInstanceCreation classInstanceCreation=ast.newClassInstanceCreation();
		classInstanceCreation.setType(ast.newSimpleType(ast.newName(reposContext.getGeneratedDacType())));
		assignment.setRightHandSide(classInstanceCreation);


		block.statements().add(ast.newExpressionStatement(assignment));

		ifStatement.setThenStatement(block);
	}

	private void buildReturnStatement(Block block) {
		ReturnStatement returnStatement=ast.newReturnStatement();
		returnStatement.setExpression(ast.newSimpleName(fieldName));
		block.statements().add(returnStatement);
	}
}
